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Organic syntheses via transition metal complexes. LXXXI. Bis(carbene) complex of chromium connected by a conjugated ammonium pentadienide bridge

1995; Elsevier BV; Volume: 502; Issue: 1-2 Linguagem: Inglês

10.1016/0022-328x(95)05766-i

1872-8561

Rudolf Aumann, B. Jasper, Roland Fröhlich, Sirpa Kotila,

Organometallic Complex Synthesis and Catalysis

The reaction of pentacarbonyl(1-ethoxyenthylidene)chromium and tetrachlorocyclopropene in the presence of triethylamine affords a bis(carbene) complex 3, in which the carbene chromium units are connected by a conjugated and planar ammonium pentadienide bridge. According to NMR measurements the compound adopts a fluctional (Z, E) configuration. The structure of 3 was established by X-ray structure analysis [C27H27Ctr2NO12 · 2Ch2Cl2, triclinic, space group P1 (No. 2), a = 12.703(1) Å, b = 12.847(1) Å, c = 13.667(2) Å, α = 95.77(1)°, β = 110.15(1)°, γ = 112.81(1)° Z = 2, R = 0.072, wR2 = 0.201].